自然九

natural fi；e───[纺]天然纤维

natural dye───天然染料

natural gift───天赋才能

naturalise───vt.使入国籍；使归化；vi.加入国籍；归化（等于naturalize）

naturalising───vt.使入国籍；使归化；vi.加入国籍；归化（等于naturalize）

naturalize───vt.移植；使入国籍；采纳；vi.归化；加入国籍

naturalizing───v.使加入……国籍；引进（动植物）；使自然化（naturalize的现在分词）

natural science───自然科学

natural bridge───天然石桥；[地理]天然桥；自然桥

Unnecessary C-sections are costlier than natural births and raise the risk of complications for the mother, said the report surveying nine Asian nations.───报告调查了九个亚洲国家后声称，不必要的剖腹产比顺产费用更高，并且增加了产妇患并发症的风险。

Nine Peaks in Songjiang are the only natural hills in Shanghai. Green trees amid the hills and red-roofed houses set off one another, with dense forests covering in the surface of the hills.───松江九峰是上海唯一一处自然山丘，山间绿树红楼掩映，山体表面林木深秀。

The nine-year study of chimps in their natural habitat at Gombe National Park in Tanzania found chimps infected with SIV had a death rate 10 to 16 times as high as uninfected chimps.───这项对生活在坦桑尼亚冈贝国家公园自然栖息地的黑猩猩进行历时九年的研究发现，感染SIV病毒的黑猩猩其死亡率比未受感染的黑猩猩高10至16倍。